[Workspace] Handle data sources and advanced settings as global object.

[SuZhou-Joe]

Description

This PR handles data sources and advanced settings specially to make global objects will be correctly handled inside workspace.

For 2.14:

• Always list data sources from global.
• Prevent data sources being created inside workspace.
• Prevent data sources being imported inside workspace.

For the long future:

• Prevent advanced settings being created inside workspace.
• Prevent advanced settings being imported inside workspace.

For the visualizations and dashboards that rely on the data sources, when importing, the reference id won't be regenerated per https://github.com/opensearch-project/OpenSearch-Dashboards/blob/main/src/core/server/saved_objects/import/regenerate_ids.ts#L41. So if users import visualizations along with data sources into a workspace, only the visualizations will be imported and it will try to reference a should-existing global data source.

Issues Resolved

closes #6523

Screenshot

Import data source

Testing the changes

• Change the yml file to enable workspace and data sources.

workspace.enabled: true
data_source.enabled: true

• Goes to advanced settings page, which will create an advanced settings objects automatically.
• Goes to saved objects management page, export all the objects
• Create a workspace
• Enter the workspace
• Goes to the saved objects management page inside the workspace
• Import objects
• There should be a error beside advanced settings saying the object can not be created inside workspace.

Changelog

• feat: [Workspace] Handle data sources and advanced settings as global object.

Check List

• All tests pass
  • yarn test:jest
  • yarn test:jest_integration
• New functionality includes testing.
• New functionality has been documented.
• Update CHANGELOG.md
• Commits are signed per the DCO using --signoff